Take a hunting knife or combat knive put it into the knife sheath or your boots,
then put your knife on the quick keys.
Now push the quick key and you listen to a sound of a gun.
It sounds like you reload your knife. But you cant shoot with it, can you.
Every player around you hear you pulling your knife or reload a gun.
So pulling your knife out, can get you in serious trouble if you are in a fight with other players.